A122471 - OEIS

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A122471 as a simple table

n	a(n)
0	1
1	6
2	40
3	277
4	1935
5	13540
6	94774
7	663411
8	4643869
9	32507074
10	227549508
11	1592846545
12	11149925803
13	78049480608
14	546346364242
15	3824424549679
16	26770971847737
17	187396802934142
18	1311777620538976
19	9182443343772813

[1,6,40,277,1935,13540,94774,663411,4643869, 32507074,227549508,1592846545,11149925803, 78049480608,546346364242,3824424549679, 26770971847737,187396802934142,1311777620538976, 9182443343772813]